【題目】You'll find it hard to get rid of the drug habit _______ you have it.

A. before

B. once

C. until

D. though

【答案】B

【解析】句意：你會發(fā)現(xiàn)一旦吸毒成癮就很難戒掉。根據(jù)句意不是before“在……之前”，也不是until“直到”。

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